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As Vinod M says, you cannot change UoM if you have movement history on the item, as this history would become meaningless - eg if your EA = 100KG then your history of say 1000 EA would appear as 1000KG, which is 100x too small. Either create a new code with KG as base UoM, or set an alternative UoM of KG against the existing material and, if necessary, use specific UoMs where required - eg Sales UoM, Production UoM, Warehouse UoM, etc.